Abstract:
A continuous process for the combustion of solid fuels under conditions such that flue gas is essentially free of particulates and oxides of sulfur and nitrogen. Fuel is charged as an aqueous slurry and additional water condensed from the flue gas may be recycled to the pressurized combustion zone. Combustion is promoted both by water vapor and alkali added with the fuel slurry, while the alkali serves also to neutralize and remove sulfur in completely oxidized, or sulfate, form. Heat of combustion raises the temperature of the reactants above the critical temperature of water, forming a hot fluid from which useful heat is transferred. Under the pressure of the system, heat recovery results in condensation of water, retaining and slurry product ash and providing recycle water, which helps to control reaction temperature as well as to promote the combustion.
Abstract:
A fuel producing system for a solid/liquid mixture. The system comprises a mixing reservoir having a first inlet for receiving a combustible liquid fuel, and a second inlet for receiving a solid fuel pulverized to a mixable state with said liquid fuel. Mixing means is provided in the mixing reservoir to mix both fuels. Quantitative control means is also provided in the reservoir to measure predetermined amounts of the liquid and solid fuels delivered therein. A holding reservoir receives the solid/liquid fuel mixture from an output conduit of the mixing reservoir. Pump means is provided in the output conduit. First control means is further provided to shut off the flow of the fuel mixture to the holding reservoir to permit the mixing of further fuel mixture in the mixing reservoir. A second control means initiates the flow of the fuel mixture to the holding tank when the mixture fluid therein is extracted to a predetermined low level.
Abstract:
A process is disclosed for producing a coal slurry from a raw coal feedstock which contains coal and gangues. The process optimizes coal recovery, coal quality and the hydraulic characteristics of the pipeline slurry.
Abstract:
A method is disclosed for burning a pulverized carbonaceous material containing sulfur and ash. According to this method, a slurry is formed containing the carbonaceous material, water and a reagent adapted to react during combustion with the sulfur in the material. The slurry is burned in a first stage with less than 100% theoretical air and preferably at a temperature below about 1100.degree. C. The products of combustion from the first stage are removed to a second stage and burned with additional air.